The sensors I put in my D3 did not require a programming pad, and were only a little over £11 for four, including shipping from the USA IIRC. That was about 7 years ago.
My understanding at the time was that it was better to have sensors with valves that kind of hinged in their mounting blocks.
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A journey of a thousand+ (epic) miles, begins with a single step, (to the door of an 8). Lau Tzu
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